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STEPHEN D. TUGKEEQOE NEW YORK, N. Y. Letters .Patent No. 66,654, dated July 9, 18677.

PRINTING MACHINE.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, STEPHEN D. TUCKER, of the city, county, and State of New York, have invented new and useful Improvements in Printing Machines," and I do hereby declare that the following is a. full, clear, and exact' description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings', forming part of this specification. l

The present invention relates to that class of printing machines known as the Type-Revolving Printing Machines, and the invention consists, first, in anovel arrangement of adjusting-screws and connecting-levers, or their respective equivalents, in combination the composition-rollers, either one or both, whereby the upward pressure of such rollers against the distributing surface or surfaces can be regulated at pleasure; and second, so arranging either one or both of the composition-rollers, in combination with a treadle or treadles, in position for being operated upon, at the outside of the machine,'that the bearings of such rollers can be so far depressed as to permit the rollers to be easily and readily lifted in or out at pleasure. In the accompanying plate of drawings my improvements in printing machines are illustrated- Figure I, Plate 1, being an elevation of one side of the machine.

Figure 2, Plate 2, ahorizontal section taken in the plane of the=line x 9:,.fig. I, plate 1', and

Figure 3, Plate 2, a transverse vertical section in detail, taken in the plane of the line yy, fig. 2, same plate.

Y Similar letters of reference indicate like parts.

A, in the drawings, represents the type-cylinder of a type-revolving printing machine," which cylinder is hung so as to revolve in a vertical plane in bearings of the parallel-side-framesB B. C, the ink-fountain roller, from which the ink is conveyed to the distributingTcylinder D by the composition-roller E running in open bearings at the points of the arms F F, These arms are keyed on a transverse horizontal shaft, G, at both of its ends, such shaft being pivoted in brackets on the side-frames B. H, a long arm projecting from centre of shaft G, 'but in an opposite direction to the arms F. The end of this arm H is made to rise by the action of the lifting-cam I on the revolving-shaft J, and thus the composition-roller E is caused to drop to the ,fountain-roller C, from which it receives a supply of ink. As the cam I passes on the spring K, which acts on the toe L fixed to the rod M that is jointedrto the long arm H, it forces down this arm, and of course lifts the composition-roller E up against the distributing-cylinder D. But to prevent this composition-roller from being pressed too hardagainst the distributing-cylinder, a lever, N, is so'arrangcd that the toe L of the rod M, in descending, by the force of the spring K will fall on one of its ends, while the other end `runs through to the outside of the side-frames, where its height is adjusted by the regulating-screw O, and thus the pressure of the composition-roller against the cylinder D is controlled at pleasure. The outer end of the lever N has a. footplate, P, by pressing which down the bearings of the roller E can be so far depressed as to permit the roller to be lifted in or out without turning the machine. The ink from the distributing-cylinder -D is conveyed to the inking surface of the type-cylinder Ahy another composition-roller, Q, which runs in open bearings in the outer ends of the arms R R. These arms are pivoted or hung on the shaft of the distributing-cylindervl), and are joined together by the dat bar S, from the centre of which the long arm T projects in an opposite direction. This long arm is lifted at the proper time by a cam, U, on the shaft J, which causes the composition-roller Q to drop away irom the inking surface of the type-cylinder as the formof type passes. As the cam U passes on the roller Q is forced up to the inking surface of the type-cylinder by a spring, V, operating on a toe, W, of the rod X attached to the long arm T, and the force of Athis spring is regulated by a lever, Y, and its adjusting.- screw, Z, in preciselv the same manner as the roller E. The lever Y also has aifoobplate, by pressing down on which the roller Q is so depressed as to be easily lifted in or out of its bearings.

What I claim as new, and desire to secure by Letters Patent, is

The lever N or Y, orboth, and adjusting-screw O or Z'or both, or their respective equivalents, when arranged to regulate the upward pressure of the rollers E or Q, or both, against the distributing surfaces, substantially as describe-d.

I also claim the lever N or Y, or both, when provided with footaplates, or their equivalents, as and for the purpose described.

. STEPHENl D. .'TU'CKEBa Witnesses e WM. F. McNAM'AEA, ALEX. F. ROBERTS, 

